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D( x )
0.8^x = 0
0.8^x = 0
0.8^x = 0
x należy do O
x in (-oo:+oo)
(1.6^x)/(0.8^x) = 0
(1.6^x)/(0.8^x) = 0 // * 0.8^x
1.6^x = 0
x należy do O
x belongs to the empty set
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